Two of three southbound lanes have reopened on the M1 Pacific Motorway following a multi-vehicle crash on the New South Wales Central Coast.

Emergency services were called to the M1 at Wyong about 1:30pm after four vehicles collided in the southbound lanes.

A woman from one of the vehicles has been taken to Gosford Hospital for treatment of minor injuries.

The other drivers and passengers of the four vehicles were uninjured and have been treated at the scene for shock.

The M1 had been closed in both directions for more than three hours.

Motorists are being told to allow extra travel time, with northbound lanes still closed with diversions in place.